Casaglia, Gherardo (2005). "Ifigenia,1 June 1957". L'Almanacco di Gherardo Casaglia (in Italian).
Moreau's alleged first name, Jean-Pierre, is reported solely by the Casaglia, Gherardo (2005). "Jean-Pierre Moreau". L'Almanacco di Gherardo Casaglia (in Italian)..
Reminiscences of Michael Kelly, Of the King's Theatre, and Theatre Royal Drury Lane (...), London, Colburn 1826, I, p. 254, (accessible for free online at Google Books). Kelly relates he performed the role of Pylades, while Antonia Bernasconi and Valentin Adamberger took those of Iphigenia and Orestes as they had done in the German version. The part of Thoas was sung by basso buffoStefano Mandini (Federico Pirani, Mandini, in Dizionario Biografico degli Italiani, Volume 68, 2007; accessible online at Treccani.it).
Joseph Schlüters, A General History of Music, London, Bentley, 1865, p. 139 (note) [accessible for free online in books.google]
Lajarte has counted exactly 408 dates in the said interval (p. 309); only Iphigénie en Aulide, among Gluck's works, scored a higher number of performances, 428, in the interval 1774 to 1824, before being dropped (Lajarte, p. 276). Both, however, were largely outclassed by Sacchini's Œdipe à Colone with its 576 representations in much the same interval, 1787 to 1830 (583 within 1844 when it was definitively dropped, too; Lajarte, p. 355)
An 1805 French edition of De la Touche's play is accessible for free online in books.google
Reminiscences of Michael Kelly, Of the King's Theatre, and Theatre Royal Drury Lane (...), London, Colburn 1826, I, p. 254, (accessible for free online at Google Books). Kelly relates he performed the role of Pylades, while Antonia Bernasconi and Valentin Adamberger took those of Iphigenia and Orestes as they had done in the German version. The part of Thoas was sung by basso buffoStefano Mandini (Federico Pirani, Mandini, in Dizionario Biografico degli Italiani, Volume 68, 2007; accessible online at Treccani.it).